AC electric rotating machine with multiphase stator coils

Abstract

A stator coil includes a belt-shaped winding band and a same-layer bridging portion. The winding band makes one or more rounds, while turning back in the axial direction a plurality of conductor wires which are aligned in parallel at a pitch of electric angle π (pi). The same-layer bridging portion connects a pair of the conductor wires which are of the same phase at the end portion of the winding and which are arranged in the same layer of the slot. Such arrangement enables forming a compact multi-phase stator coil.

1. An AC electric rotating machine comprising:
 a cylindrical stator core having plural slots; and 
 a multi-phase stator coil that is housed in the plural slots of the cylindrical stator core, 
 wherein the stator coil comprises: 
 a belt-shaped winding band, the winding band including a plurality of conductor wires that are sequentially housed in the slots that are separated from each other by electric angle substantially π and which are aligned in parallel, and the winding band going around the stator core for two or more times while turning back in the axial direction at a pitch of electric angle substantially π, and 
 a same-layer bridging portion, the same-layer bridging portion including a plurality of bridging conductor portions which are provided on an outer side of one end face of the stator core for connecting end portions of the same phase which are separated from each other by an electric angle π of end portions of each of the conductor wires, and the same-layer bridging portion being formed separately from the conductor wires of the winding band and joined to the end portion of the winding band or includes a part of the conductor wires of the winding band; 
 wherein the bridging conductor portion of the same-layer bridging portion connects the end portions of the same phase of each of the conductor wires which are protruded from the same layer of each of the slots; and 
 the conductor wire comprises: 
 plural slot conductor portions which are sequentially housed in two different layers of the slots of the same phase which are separated from each other by electric angle π, and 
 a different-layer bridging portion which communicates the end portions of a pair of the slot conductor portions which are housed in two different layers of the slots of the same phase which are separated from each other by electric angle π on the outer side in the axial direction of the stator core to form a coil end portion; 
 wherein each of the bridging conductor portions of the same-layer bridging portion is arranged at a position overlapped in the axial direction with a protruded conductor portion formed of the end portion of the conductor wire protruded outwards in the axial direction, and extends at least in the circumferential direction; and 
 wherein each of the bridging conductor portions has a substantially V-letter shape which includes a one half portion extending in one of the circumferential directions and inwards in the axial direction, and an other half portion extending in one of the circumferential directions and outwards in the axial direction from the end portion of the one half portion, and 
 the one half portion and the other half portion of the bridging conductor portion extend separately from each other in the radial direction by an amount equal to thickness or more in the radial direction of the bridging conductor portion. 
 
   
   
     2. The AC electric rotating machine according to  claim 1 , wherein the one half portion of the each bridging conductor portion of mutually different phases are arranged at the same position in the radial direction except the end portions, the other half portion of the each bridging conductor portion of mutually different phases are arranged at the same position in the radial direction except the end portions, and the one half portion and the other half portion are arranged adjacent to each other in the radial direction. 
   
   
     3. The AC electric rotating machine according to  claim 1 , wherein the same-layer bridging portion is arranged at a position which is overlapped in the radial direction with the different-layer bridging portion which forms the coil end portion of the winding band. 
   
   
     4. An AC electric rotating machine comprising:
 a cylindrical stator core having plural slots; and 
 a multi-phase stator coil that is housed in the plural slots of the cylindrical stator core, 
 wherein the stator coil comprises: 
 a belt-shaped winding band, the winding band including a plurality of conductor wires that are sequentially housed in the slots that are separated from each other by electric angle substantially π and which are aligned in parallel, and the winding band going around the stator core for two or more times while turning back in the axial direction at a pitch of electric angle substantially π, and 
 a same-layer bridging portion, the same-layer bridging portion including a plurality of bridging conductor portions which are provided on an outer side of one end face of the stator core for connecting end portions of the same phase which are separated from each other by an electric angle π of end portions of each of the each conductor wires, and the same-layer bridging portion being formed separately from the conductor wires of the winding band and joined to the end portion of the winding band or includes a part of the conductor wires of the winding band; 
 wherein the bridging conductor portion of the same-layer bridging portion connects the end portions of the same phase of each of the conductor wires which are protruded from the same layer of each of the slots; and 
 the conductor wire comprises: 
 plural slot conductor portions which are sequentially housed in two different layers of the slots of the same phase which are separated from each other by electric angle π, and 
 a different-layer bridging portion which communicates the end portions of a pair of the slot conductor portions which are housed in two different layers of the slots of the same phase which are separated from each other by electric angle π on the outer side in the axial direction of the stator core to form a coil end portion; 
 wherein each of the bridging conductor portions of the same-layer bridging portion is arranged at a position overlapped in the axial direction with a protruded conductor portion formed of the end portion of the conductor wire protruded outwards in the axial direction, and extends at least in the circumferential direction; and 
 wherein each of the bridging conductor portions has a substantially V-letter shape which includes a one half portion extending in one of the circumferential directions and inwards in the radial direction, and an other half portion extending in one of the circumferential directions and outwards in the radial direction from the end portion of the one half portion, and 
 the one half portion and the other half portion of the bridging conductor portion extend separately from each other in the axial direction by an amount equal to thickness or more in the axial direction of the bridging conductor portion. 
 
   
   
     5. The AC electric rotating machine according to  claim 4 , wherein the one half portion of the each bridging conductor portion of mutually different phases are arranged at the same position in the axial direction except the end portions, the other half portion of the each bridging conductor portion of mutually different phases are arranged at the same position in the axial direction except the end portions, and the one half portion and the other half portion are arranged adjacent to each other in the axial direction. 
   
   
     6. An AC electric rotating machine comprising:
 a cylindrical stator core having plural slots; and 
 a multi-phase stator coil that is housed in the plural slots of the cylindrical stator core, 
 wherein the stator coil comprises: 
 a belt-shaped winding band, the winding band including a plurality of conductor wires that are sequentially housed in the slots that are separated from each other by electric angle substantially π and which are aligned in parallel, and the winding band going around the stator core for two or more times while turning back in the axial direction at a pitch of electric angle substantially π, and 
 a same-layer bridging portion, the same-layer bridging portion including a plurality of bridging conductor portions which are provided on an outer side of one end face of the stator core for connecting end portions of the same phase which are separated from each other by an electric angle π of end portions of each of the conductor wires, and the same- layer bridging portion being formed separately from the conductor wires of the winding band and joined to the end portion of the winding band or includes a part of the conductor wires of the winding band; and 
 wherein the bridging conductor portion of the same-layer bridging portion connects the end portions of the same phase of each of the conductor wires which are protruded from the same layer of each of the slots; and 
 the conductor wire comprises 
 plural slot conductor portions which are sequentially housed in two different layers of the slots of the same phase which are separated from each other by electric angle π, and 
 a different-layer bridging portion which communicates the end portions of a pair of the slot conductor portions which are housed in two different lavers of the slots of the same phase which are separated from each other by electric angle π on the outer side in the axial direction of the stator core to form a coil end portion; and 
 wherein the winding band has a peripheral end different-layer bridging portion which is a different-layer bridging portion for communicating the slot conductor portion forming a tail end of the Nth (wherein N is an integer 1 or more) orbit and the slot conductor portion forming a start end of the (N+1)-th orbit, and goes around two or more times, and the peripheral end different-layer bridging portion has a shape which is different from other of the different-layer bridging portions when viewed in the axial direction, and is arranged at a position where the other different-layer bridging portions are not arranged. 
 
   
   
     7. The AC electric rotating machine according to  claim 6 , wherein
 the other different-layer bridging portion on the N-th orbit communicates the slot conductor portion housed in the M-th layer on one end side in the circumferential direction and the slot conductor portion housed in the (M+1)-th layer on the other end side in the circumferential direction, 
 the other different-layer bridging portion on the (N+1)-th orbit communicates the slot conductor portion housed in the (M+2)-th layer on one end side in the circumferential direction and the slot conductor portion housed in the (M+3)-th layer on the other end side in the circumferential direction, and 
 the peripheral end different-layer bridging portion communicates the slot conductor portion housed in the (M+2)-th layer on one end side in the circumferential direction and the slot conductor portion housed in the (M+1)-th layer on the other end side in the circumferential direction. 
 
   
   
     8. The AC electric rotating machine according to  claim 6 , wherein the conductor wires and the bridging conductor portions are formed of rectangular wires. 
   
   
     9. The AC electric rotating machine according to  claim 6 , the AC electric rotating machine forming an AC generator for a vehicle. 
   
   
     10. An AC electric rotating machine comprising:
 a cylindrical stator core having plural slots; and 
 a multi-phase stator coil that is housed in the plural slots of the cylindrical stator core, 
 wherein the stator coil comprises: 
 a belt-shaped winding band, the winding band including a plurality of conductor wires that are sequentially housed in the slots that are separated from each other by electric angle substantially π and which are aligned in parallel, and the winding band going around the stator core for two or more times while turning back in the axial direction at a pitch of electric angle substantially π, and 
 a same-layer bridging portion, the same-layer bridging portion including a plurality of bridging conductor portions which are provided on an outer side of one end face of the stator core for connecting end portions of the same phase which are separted from each other by an electric angle π of end portions of each of the conductor wires, and the same-layer briding portion being formed separately from the conductor wires of the winding band and joined to the end portion of the winding band or includes a part of the conductor wires of the winding band; 
 wherein the bridging conductor portion of the same-layer bridging portion connects the end portions of the same phase of each of the conductor wires which are protruded from the same layer of each of the slots; and 
 the conductor wire comprises 
 plural slot conductor portions which are sequentially housed in two different layers of the slots of the same phase which are separated from each other by electric angle π, and 
 a different-layer bridging portion which communicates the end portions of a pair of the slot conductor portions which are housed in two different layers of the slots of the same phase which are separated from each other by electric angle π on the outer side in the axial direction of the stator core to form a coil end portion; and 
 wherein the bridging conductor portion of the same-layer bridging portion is formed separately from the conductor wire of the winding band and joined to the end portion of the winding band; and 
 wherein the winding band has a peripheral end different-layer bridging portion which is a different-layer bridging portion for communicating the slot conductor portion forming a tail end of the Nth (wherein N is an integer 1 or more) orbit and the slot conductor portion forming a start end of the (N+1)-th orbit, and goes around two or more times, and the peripheral end different-layer bridging portion has a shape which is different from other of the different-layer bridging portions when viewed in the axial direction, and is arranged at a position where the other different-layer bridging portions are not arranged. 
 
   
   
     11. An AC electric rotating machine comprising:
 a cylindrical stator core having plural slots; and 
 a multi-phase stator coil that is housed in the plural slots of the cylindrical stator core, 
 wherein the stator coil comprises: 
 a belt-shaped winding band, the winding band including a plurality of conductor wires that are sequentially housed in the slots that are separated from each other by electric angle substantially π and which are aligned in parallel, and the winding band going around the stator core for two or more times while turning back in the axial direction at a pitch of electric angle substantially π, and a same-layer bridging portion, the same-layer bridging portion including a plurality of bridging conductor portions which are provided on an outer side of one end face of the stator core for connecting end portions of the same phase which are separated from each other by an electric angle π of end portions of each of the conductor wires, and the same-layer bridging portion being formed separately from the conductor wires of the winding band and joined to the end portion of the winding band or includes a part of the conductor wires of the winding band; 
 wherein the bridging conductor portion of the same-layer bridging portion connects the end portions of the same phase of each of the conductor wires which are protruded from the same layer of the each slot; and 
 the conductor wire comprises: 
 plural slot conductor portions which are sequentially housed in two different layers of the slots of the same phase which are separated from each other by electric angle π, and 
 a different-layer bridging portion which communicates the end portions of a pair of the slot conductor portions which are housed in two different layers of the slots of the same phase which are separated from each other by electric angle π on the outer side in the axial direction of the stator core to form a coil end portion; 
 wherein the end portion of the winding band is formed by an end portion of the each conductor wire which is protruded from the each conductor wire housed either in an innermost layer which is on the innermost side in the radial direction or in an outermost layer which is on the outermost side in the radial direction of many layers of the slot; and 
 wherein the winding band has a peripheral end different-layer bridging portion which is a different-layer bridging portion for communicating the slot conductor portion forming a tail end of the N-th (wherein N is an integer 1 or more) orbit and the slot conductor portion forming a start end of the (N+1)-th orbit, and goes around two or more times, and 
 the peripheral end different-layer bridging portion has a shape which is different from other of the different-layer bridging portions when viewed in the axial direction, and is arranged at a position where the other different-layer bridging portions are not arranged.